root@sclrdev:/home/sclr/certs/FreshCerts# curl --ftp-ssl --verbose ftp://{abc}/ -u trup:trup --cacert /etc/ssl/certs/ca-certificates.crt
* About to connect() to {abc} port 21 (#0)
* Trying {abc}...
* Connected to {abc} ({abc}) port 21 (#0)
< 220-Cerberus FTP Server - Home Edition
< 220-This is the UNLICENSED Home Edition and may be used for home, personal use only
< 220-Welcome to Cerberus FTP Server
< 220 Created by Cerberus, LLC
> AUTH SSL
< 234 Authentication method accepted
* successfully set certificate verify locations:
* CAfile: /etc/ssl/certs/ca-certificates.crt
CApath: /etc/ssl/certs
* SSLv3, TLS handshake, Client hello (1):
* SSLv3, TLS handshake, Server hello (2):
* SSLv3, TLS handshake, CERT (11):
* SSLv3, TLS alert, Server hello (2):
* SSL certificate problem: unable to get local issuer certificate
* Closing connection 0
curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: http://curl.haxx.se/docs/sslcerts.html
curl performs SSL certificate verification by default, using a "bundle"
of Certificate Authority (CA) public keys (CA certs). If the default
bundle file isn't adequate, you can specify an alternate file
using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
the bundle, the certificate verification probably failed due to a
problem with the certificate (it might be expired, or the name might
not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
the -k (or --insecure) option.
ベストアンサー1
cURL はサーバーから提供された証明書を検証できないため、失敗します。
これを機能させるには 2 つのオプションがあります。
cURL を、
-k安全でない接続を許可するオプション付きで使用します。つまり、cURL は証明書を検証しません。ルートCA（サーバー証明書に署名するCA）を
/etc/ssl/certs/ca-certificates.crt
オプション 2 は、安全な FTP サーバーに接続していることを保証するオプションであるため、このオプションを使用する必要があります。